[YottaDB#264] Zero pad the hexadecimal pid in the backup temporary fi…

…le name to keep its length at 4-bytes even if the process_id is less than 2**24

sr_port/mupip_backup.c

@@ -610,8 +610,12 @@ void mupip_backup(void)
 				mubclnup(rptr, need_to_del_tempfile);
 				mupip_exit(ustatus);
 			}
-			/* Creating temp filename here. Check if we have the required space. */
-			nbytes = SNPRINTF(tempfilename, SIZEOF(tempfilename), "%.*s/%.*s_%4x_XXXXXX",
+			/* Creating temp filename here. Check if we have the required space.
+			 * Use %04x (instead of %x) for process_id to ensure we have 4 bytes always even if process_id
+			 * is a small number (< 2**24 etc.) and is 0-filled on the left if needed. Makes the length
+			 * deterministic instead of being dependent on the process_id.
+			 */
+			nbytes = SNPRINTF(tempfilename, SIZEOF(tempfilename), "%.*s/%.*s_%04x_XXXXXX",
 				tempdir_full.len, tempdir_full.addr, gv_cur_region->rname_len, gv_cur_region->rname, process_id);
 			if ((0 > nbytes) || (nbytes >= SIZEOF(tempfilename)))
 			{	/* Error return from SNPRINTF */